Ep 10. FALLS, FALLS, FALLS

In the Ben 10 2016 season 4 episode 10 titled "FALLS, FALLS, FALLS," Ben Tennyson and his grandpa Max go on a road trip to visit Gravity Falls, a paranormal town in Oregon. Upon arriving, they meet Dipper and Mabel Pines, twin siblings who work at their great-uncle's tourist trap, the Mystery Shack. While exploring the town, Ben and Max discover that weird things have been happening around Gravity Falls, and they suspect that an alien invasion is imminent.

Meanwhile, Dipper and Mabel introduce Ben to their friends, including Wendy, a chill and laid-back teen who works at the town's convenience store; Sev'ral Timez, a boy band who sings catchy tunes but hides a dark secret; and Gideon, a charming but shady 9-year-old who owns a rival tourist attraction called the Tent of Telepathy. As the group hang out, they encounter strange creatures, like the gnomes who are obsessed with Mabel and the living wax figures who come alive after hours.

When Ben and Max share their concerns with Dipper and Mabel, the siblings reveal that they have dealt with supernatural phenomena before and offer to help. Together, they search for clues and try to make sense of the bizarre events. They find a mysterious journal that belonged to Dipper's great-uncle, Stan, and learn about a powerful artifact called the Infinity-Key. The Infinity-Key is said to have the power to open portals to other dimensions, and it's hinted that someone is looking for it.

As Ben and the gang investigate further, they discover that Gideon has been using dark magic to control the townspeople and steal the Infinity-Key. Gideon reveals that he plans to use the key to summon an army of invading aliens and take over the world. In a climactic battle, Ben and the gang team up to stop Gideon and his minions, using their unique abilities and teamwork to defeat them.

In the end, Ben and Max bid farewell to their new friends and continue their road trip. As they drive away, they reflect on the surreal adventure they just had and wonder what other strange encounters await them in the future.

Overall, "FALLS, FALLS, FALLS" is a fun and exciting crossover episode that brings together two beloved animated series. The blend of Ben 10's action-packed sci-fi elements and Gravity Falls' quirky humor and supernatural mysteries makes for a delightful viewing experience. Fans of either series will enjoy seeing their favorite characters interact and work together to save the day.