I vaguely recall this movie and desperately want to identify what it is. These are the memories I have of it.
- Father (main character) makes the decision not to pursue career and focus on his family (wife and one kid) while old friend/nemesis become very successful.
- Family gets kidnapped or threaten by someone who turns out is the main character but from a different timeline where he became a renowned scientist and built a box-like machine to travel across realities. This machine requires some kind of serum to be used.
- He visits multiple realities including one where the world is covered in snow completely frozen and another one with a plague killing most people.
- Family is saved but a ton of additional copies of himself show up also wanting to get their family back (but there is a single copy of said family). Cliffhanger is a huge fight in some remote cabin where they were trying to hide from them.
- Turns out the machine is controlled by emotions so the kid is in charge of relocating the family, this way the other copies of the protagonist won't find them.
I have a very visual memory, I don't recall any name sadly. Thanks for your help!