Shares of Logitech (LOGI) - Get Report have been on fire this year, climbing 47%. On Thursday, shares tacked on another 2% gain, and the stock now boasts a 140% rally over the past 12 months.

So what's driving the success at Logitech? Try eSports, TheStreet's Jim Cramer, manager of the Action Alerts PLUS portfolio, said on CNBC's "Mad Dash" segment.

eSports is the league of competitive online video-gaming. It's one of the most underrated trends in the market and one that is sweeping the nation.

Don't think it's a big deal? Just look at the evidence: There are even collegiate teams, leagues and scholarships for top gamers, and Cramer pointed out a recent Washington Post article exploring the perks and pitfalls of gaming's expansion.

Logitech is just one of the companies getting a boost from eSports. Another is Take-Two Interactive Software (TTWO) - Get Report , which is up 106% over the past 12 months.

Take-Two owns the NBA team rights for eSports, which makes it a big attraction. The company's franchises are worth billions, Cramer added.

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At the time of publication, Cramer's Action Alerts PLUS had no position in any companies mentioned.