Stargate with Kurt Russell

How about the movie “The One” with Jet Li.
I haven’t seen it all the way through, but it’s about how people have alternate existences in several other dimensions and to find another of yourself and kill him/her, you gain power and intelligence.

“There is not one universe, but there are many, which is a multiverse. Supposing you are just one person, there are many other versions of you in the other universes, there are ways to travel, but only a police agency,MVA, can travel only for police procedures. Gabriel Yulaw (Jet Li)is a former MVA agent, who killed another version of himself in self-defense. It made the other versions of him stronger. When Yulaw found out about this, he became power-hungry killing the 122 other versions for two years.” Quoted from IMDB.com

Herbie Fully Loaded. It transports you to a magical universe where women can drive cars without crashing into every other goddamn thing in the parking lot.

Event Horizon-
In the year 2047 a group of astronauts are sent to investigate and salvage the long lost starship “Event Horizon”. The ship disappeared mysteriously 7 years before on its maiden voyage and with its return comes even more mystery as the crew of the “Lewis and Clark” discover the real truth behind its disappearance and something even more terrifying
Event Horizon (1997)

From Beyond 1986 Dr. Edward Pretorious (Ted Sorel) and his assistant Crawford Tillinghast (Jeffrey Combs) create a resonator that stimulates the brain and allows one to see creatures that exist in another dimension)

My Science Project 1985
my personal fav
The fourth dimension, time, is involved in this story about a group of friends who discover that an alien object throws them into the past with dinosaurs and into the future with an army equipped with weapons unknown to them. Bad, but Dennis Hopper keeps it from being a bomb

and i love
The Philadelphia Experiment (1984) Reportedly based on a true incident during World War II involving an anti-radar or invisibility experiment that caused a US Navy Destroyer Eldridge to disappear from Philadelphia Harbor. A sailor finds himself thrown into the future (1984). )

Hellboy

Not a movie but the Television show Sliders was an excellent if not comedic few in to trans-dimensional travel

Here is a list of other possible films

donnie darko