I'm looking for the title of a cartoon that we used to watch as kids. It was always on a VHS tape my mom made us with railway dragon and brave little toaster.. All I can remember is an alien type thing that could fly I'm pretty sure.. and a time machine and he rode the roller coaster at night.. And there was a 3 headed dragon in it as well at one point... That's about all I got lol..

Marvin the Martian, maybe?