Ben 10 - Season 3 - Eps 6: Game Over
The Tennysons stay in as it rains outside, and Ben plays a video game to pass the time by. When Gwen decides to join in, Ben is jealous of how she's a far superior player. Instead, Ben decides to transform to Upgrade, and merges with the game console. Gwen makes an attempt at shaking him off, but suddenly, a lightning strike causes them to transfer into the video game itself. The only way Ben can use the Omnitrix is to find coins with the different aliens on it. To get out, they must find the Upgrade coin before an evil being uses it to escape into the real world.
About Ben 10

Title: Ben 10
First Air Date: 2005-12-27
Last Air Date: 2008-04-15
Status: Ended
Rating: 8.166/10 (from 1676 votes)
Language: EN
Seasons: 5
Total Episodes: 52
Network: Cartoon Network
Genres: Animation, Sci-Fi & Fantasy, Action & Adventure, Comedy, Kids
Production Companies: Cartoon Network Studios, Man of Action Entertainment
Synopsis
When 10-year-old Ben Tennyson discovers a mysterious device, he gains the power to change into ten different alien heroes, each with uniquely awesome powers. With such abilities at his disposal, Ben realizes a greater responsibility to help others and stop evildoers, but that doesn't mean he's above a little superpowered mischief now and then.
Cast

Tara Strong
Ben Tennyson (voice)

Meagan Moore
Gwen Tennyson (voice)

Paul Eiding
Grandpa Max (voice)